Virbac Knockout E.S. Area Treatment Spray, 16-fl oz can

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About This Item

Details

  • Rapidly kills active flea and tick infestations with active ingredients pyrethrins, permethrin, and pyriproxyfen (an Insect Growth Regulator).
  • Prevents flea infestations from developing for up to 7 months by stopping immature fleas from developing into the adult biting stage.
  • Reaches fleas hidden in carpets, rugs, drapes, upholstery, pet bedding, and floor cracks for greater effectiveness.
  • Leaves no unpleasant odor or sticky mess, and does not stain furnishing when used as directed.
  • Covers and treats 2,100 square feet.

Ingredients

Instructions

FAQ

Learn More About Virbac From Our Team of Experts
Important Information

Fleas rise to the top of your pet's coat as they die, so consider it a triumph if you start seeing more fleas at first, after treating your pet. If you’re still seeing fleas after application, it may be because your pet has picked up new fleas from the environment, which may include other pets, surfaces and outdoor areas. It may take up to 30 days to break the entire flea life cycle. Additionally, you should also treat sources of new fleas (i.e., carpet, yard, etc.) to ensure complete flea control.

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Questions & Answers

53 Customer Questions

Does this treat carpet beetles?

Answer by Karen • Oct 30, 2025
I got a can of knock out from a puppy party and I was able to spray #1x and now nothing comes out I took the nozzle off soak in hot water used a safety pin in the hole and it did nothing what can I do the fleas are getting worse

When is it safe to be back in a treated area?

Answer by Chewy • Dec 06, 2019
Treated areas should be vacated during application and allowed to fully dry (at least 2 hours) before pets are back in contact with treated area.

I live in an apartment. Can I treat one room and then have the cats and I sit in another and close the door and wait 2 hours until it dries? Or do we have to leave?

Answer by Autumn N • Apr 30, 2024
Treated areas should be vacated during application. It is recommended to thoroughly ventilate treated area for a minimum of 2 hours before returning to the area.

Does Knockout have to touch all surfaces to kill the fleas or does it just need to be sprayed in the room?

Answer by Chewy • Oct 31, 2018
This would need to touch the surface to treat. Hold can at arm's length and direct spray toward the area to be treated. Use a sweeping motion to apply product and back away from treated area while holding the can 36 inches away from the surface being treated. Areas of 80-100 sq ft can be treated in approximately 10 seconds with Knockout E. S. Area Treatment. When treating upholstered furniture, treat under cushions and areas where flea development occurs. Cover aquariums and fish bowls and remove birds from area prior to treating. Treated areas should be vacated during application.
Reviews
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4.5
Rated 4.5 out of 5 stars
530 Ratings
Terms & Conditions

Customers Mention

Chewy identifies key considerations with the help of artificial intelligence and our veterinarians.

Duration of Protection

84% Positive

Ease of Application

85% Positive

Effectiveness

84% Positive

Safety

74% Positive

322 Customer Reviews

Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.

Rated 5 out of 5 stars
By Cynthia on Oct 8, 2025

Excellent product

My pups picked up fleas on a walk and by the time I knew it, we all had fleas. My pups are indoors except for bathroom breaks. It was SO bad. Even my car had been

My pups picked up fleas on a walk and by the time I knew it, we all had fleas. My pups are indoors except for bathroom breaks. It was SO bad. Even my car had been infested. After flea combing, dips and finally flea drops I had to treat the indoors. Sprayed all the soft surfaces (couches and beds), base boards and curtains all the flea’s were dead. I have to admit I didn’t know if it would work. It’s a very very fine mist that works incredibly well. I will have it on standby as you never know when these things are bound to happen.

Rated 5 out of 5 stars
By Tina on Sep 19, 2025

I love this product

I buy this once a year to prevent flea infestation in my home. It's easy to use and really works. Fleas are bad August thru the first good frost . Even though i

I buy this once a year to prevent flea infestation in my home. It's easy to use and really works. Fleas are bad August thru the first good frost . Even though i use a topical flea treatment on my dogs they're bound to bring fleas in with them. This product stops them from setting up house in my home!

Rated 5 out of 5 stars
By James on Dec 20, 2025

Finally!!!!!!!

After years of a flea nightmare I have finally found something that actually works!!!!!

After years of a flea nightmare I have finally found something that actually works!!!!!

Rated 5 out of 5 stars
By erik on Nov 7, 2025

Instant action

Let it sit for 24 hours and ran the sweeper really good over everything have yet to see a flea!!! This stuff is amazing!

Let it sit for 24 hours and ran the sweeper really good over everything have yet to see a flea!!! This stuff is amazing!

Rated 2 out of 5 stars
By Tawnya on Jul 18, 2025

aerosol

I held it as close to the floor as a could, but the way it came out of the can was more like a bug bomb and it went all over everything. I don't have normal cupboards

I held it as close to the floor as a could, but the way it came out of the can was more like a bug bomb and it went all over everything. I don't have normal cupboards with doors so I had to wash down all my dishes and throw away a lot of stuff that was on the countertop. The directions for us did warn me, and that's why I tried to keep it near the floor, but that isn't going to help with this particular stuff. I'll go back to using the other brand I usually get that isn't aerosolized so I have better control over where it lands.

Rated 5 out of 5 stars
By Heather on Jun 15, 2025

Can't recommend enough

My 84 year old mom was horrified to discover that fleas had been brought into her condo. (A stray cat had been sitting on her chair outside and when she sat on

My 84 year old mom was horrified to discover that fleas had been brought into her condo. (A stray cat had been sitting on her chair outside and when she sat on the cushion had brought them in.). By the time she had agreed to let me treat her place she had them not just on her cat but throughout the condo. I used this to spray on her floors and under cushions and after treating, the fleas were gone. It was easy to use. The only thing I'd say against it was that it was listed as being enough for a larger area but my mom's condo was smaller and I ended up using the entire can. Granted, how much you spray makes a difference, but if your area being treated is close to the area listed on the can, I'd recommend getting two cans.

Rated 5 out of 5 stars
By Elizabeth on Dec 20, 2025

Quality product

This premise spray with IGR really works to control fleas.

This premise spray with IGR really works to control fleas.

Rated 1 out of 5 stars
By Joy on Aug 18, 2025

Didn't help

I took the cat tree outside three different occasions and dusted it with this stuff. It's supposed to work for several months... didn't work at all. I bought two

I took the cat tree outside three different occasions and dusted it with this stuff. It's supposed to work for several months... didn't work at all. I bought two cans of this stuff. What a waste of money.

Rated 5 out of 5 stars
By Joanna on Nov 26, 2025

Phoebe

Knockout really works! But I wear a mask and take a shower afterwards.

Knockout really works! But I wear a mask and take a shower afterwards.

Rated 5 out of 5 stars
By JoAnne on Aug 22, 2025

Recommend by our vet

My husband had fleas in his shop from a neighbor's dog that visited. We bombed and tried OTC spray which worked for a day. This spray was recommended by our vet

My husband had fleas in his shop from a neighbor's dog that visited. We bombed and tried OTC spray which worked for a day. This spray was recommended by our vet and fleas are finally gone.